Lock.



J. MUELLER.

LOCK.

APPLICATION FILED MAR 18 1912. 1 067 187. Patented July 8, 1913.

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[Ia have holes 30 and ,I ,1 fm. and apposite, thew key f r gmiim' pins and re- I x; a Hwve, pins 32 and 33 211-. sf 1.0L 1 F ion and therefore require k 2h 21 taywzred hale in its H R TheoL-k bnit g. 23 gnd-r-d in the casing as x v w'afh hm) pairs 0f key mu pair positioned p iurniity 0f tum-- (swing and pmmfi mrzzfingz Wfl'h um Thswe tumu-3* w. mwt'inru iimh tumpositioned above the key hole 31, and the tumbler is extended above its rack as shown at 38 and recessed to provide a second bit engaging part 39 positioned abovethe key hole 30. These bit engaging parts are so the left side of the lock, and so that the set 1 comprising the parts 38 will properly cooperate With the key when inserted from the right side of the lock. It will also be noted that each tumbler is provided with a pair of reversely arranged key bit engaging parts, one of said parts being engageable by a key from one side of the lock and the other of said parts being engagcable by a key from the other side of the lock. W th this unsynnnetrical arrangement of ti 1- blers the protective value of the lock will be greatly increased and it is possible to obtain a very much greater number of different combinations than with the symmetrical arrangement.

It will be noted that with this lock the number of different combinations increases in a geometrical progression with the number of tumblers, while with the symmetrical arrangement the number of difi'erent combinations increases with half the number of tumblers. It will thus be seen that the present invention provides a lock having a greater protecting value, and a larger num ber of possible combinations. As the tumblers are stamped their expense'will not be greater than those of the ordinary type. The lock bolt is arranged to be extended and retracted in steps as shown.

A lever 40 is pivoted on the frame 35 at 41 and connected by a slot with a pin 42 on the latch bolt. A. second lever 43 is pivoted to the frame at 44 and also has a slotted connection with the pin 42. When the lock bolt is retracted as shown in Fi 1, the ends 45 and 46 of the levers 40 an 43 respectively will be adjacent the key holes 30 and 31 respectively. If the key is inserted in either key hole 30 or 31 and turned in a direction as to retract the lock bolt, the key will engage the end 45 or 46 and retract the latch bolt. Fig. 2 shows the lock bolt partially extended. The ends 45 and 46 are at this time out of reach of the key so that the latch bolt cannot be retracted at this time.

arranged reversely This latch bolt is however free to be retracted by the knob. Fig. 3 shows the lock bolt fully extended. The lever 40 now engages a shoulder 47 on the frame 35, and the lever 43 engages a lug 48 (which is one of the spacing and securing lugs between the plates 12 of the casing). The latch bolt will now be locked by the levers 40 and 4 3. It will be noted that -the lever 40 bent as shown'at 49, Fig. 1, so that the lower end of this lever will lie in the open space in the frame 33. \Vhen a key inserted from either side is turned to re tract: the lock bolt, it will successively retract the lock bolt one step and unlock the latch bolt, then fully retract the lock bolt, and Further revolution of the key so used will retract the latch bolt.

It is sometimes desirable to provide an unlocking means on the inside of the door which forms a permanent part of the lock. Referring to Figs. 5 and 6, designates a key which may be. provided With any suitable handle. ik plate 51 having a lug 52 entering and closing the keyhole, is clamped to the inside side plate 12 by means of a screw 53. A pair of members 5 are pivoted on the screw 53 and engage an elliptical portion 55 of the key. A spring 56 positioned in a groove on the members I) l; holds these members vieldinglv against the portion 55 and tends tohold the key ertical.

It is obvious that various changes may be made in details of CODStt "lCil0l), within the scope of the claims, without departing' from the spirit of this invention, and it is therefore to be understood that this inven tion is not to be limited to the specific con struction shown and described.

Having thus described the invention what is claimed is:

1. In a lock, the combination with a bolt, of tumblers therefor having key bit engaging parts constructed and arranged to cooperate with a key having nnsymmetrically arranged key bit steps, when inserted from either of the opposite sides of the lock.

2. In a lock, the combination with a lock casing having key-holes in its opposite walls, and a bolt in said casing, of. tumblers in said casing having key engaging parts constructed and arranged to cooperate with a key having unsyini'netrically arranged key bit steps when inserted through either key hole.

3. In a look, a tumbler having a plurality of key bit engaging parts positioned one abo'n the other and constructed and arranged to be engaged by the bit of the same key at different times to mm e the tumbler in the same direction.

4. In a lock, a tumbler having a recess therein forming a rack, and having key bit engaging parts positioned on opposite sides of said rack.

5. In a lock, it tumbler having key hit 5 thereon, whereby a plurality of unsyminetribolt.

gaging parts constructed and arranged to be engaged by the bit of the same key, and whereby the engagement of the key with said key bit an aging parts moves the tumbler in the sam v 6; In a lock having key holes positioned direction.

out of alinemen-t, the combination with a latch bolt and a lock bolt, of means for re-,

tracting, said latch bolt, and means posh tloned in the path of a key inserted in either key hole to retract said latch bolt.

7. Ina lock having key holes positioned 8. In a lock having key holes positioned 20. out of "alinement, the combination with'a latch bolt'and a lock bolt, of a plurality'of members connecting said bolts, said mem? bers being placed adjacent .the key 'hole'swhen said lock bolt is retracted. y 9. In a lock, thecombination with a bolt,

parts, said tumblers being constructedrand arranged to be operatedjrom either side of the lock. f

10. In a lock, the combination with a bolt, of a plurality of unsymmetr'ically arranged tumblers therefor, said tumblers being constructed and arranged to be operated by a having unsymmetrically arranged key bit steps, from either side of the lock.

11. In a lock, the combination with a bolt, of a plurality of unsymmetrically arranged tumblers therefor, each tumblerhaving a plurality of key bit engaging parts cally arranged key-bit engaging parts are formed, one of said sets being operablerby a key from one side of the lock, and another of said sets being operable by a key from the other side of the lock. a 5

12. In a lock, the combination with a bolt, of a plurality of tumblers therefor, each tumbler having a plurality of key bit engaging parts thereon constructed and arversely arranged key bit engaging parts.

13. In a lock, the combination with a bolt,

gaging parts thereon constructed and ar ranged to form a plurality of reversely arranged sets, one set cooperating with a key inserted from one side of the lock, and another set cooperating with a key inserted from the other side of the lock.

14.1In a lock having key holes positioned ranged to form a plurality of sets of are:

of a plurality of tumblers therefor, each tumbler having a plurality of key.bit enout of. alinement, the combination with a:

bolt, of a plurality of tumblers therefor, each tumblen having a plurality of key bit en gaging parts thereon, said key bit engaging parts being arranged in sets, one set adjaof a plurality of tumblers therefor having. unsymmetrically arranged key bit engaging cent each key hole, whereby said tumblers may be operated by akey having unsymmetrically arranged key bit steps.

151A lock having a tapering key positioning pin constructed to enter and 006 crate with a likeaperture in the shank of a ey.

16. A lock casing having key holes positioned out of alinement inits opposite walls, and tapering key positioning pins opposite said key holes and constructed to enter and cooperate with a like aperturein the shank of a key. v

In testimony whereof I aflixmy signature in presence of two witnesses.

JOSEPH MUELLER. Witnesses:

FRANKLIN MILLER, J. H. BRUNINGA. 

